GG,
If you think about the difference between what you explained in example 2, and your last reply about your bluff, I think the first example clearly states that Player C mucked before any reaction from Player B. You would have to question why a player would give up any chance for the pot by raising, and folding?
Your last situation is quite different. You said; you think it could be too easy (to take your bet back) if you were bluffing, and you felt that you were going to be called. think of what would have to occur:
1. If Player B said "I call" it would be too late for Player C to even muck.
2. What if your opponent was acting like he was going to call, just to get a reaction from you? With no real intention to call? You might save your raise amount, but you would lose the pot.
3. If the dealer prevented you from mucking, he could have saved you from: possibly winning the pot or; being called and losing the complete amount.
I really think it would be much too risky for any player to attempt such an unethical way to save a few chips, with no chance at winning the pot.
I'd like to know how you would accomplish such a move. Why don't you try it some time and let me know how it works for you?

I'm kidding, of course. It's a great question that makes you think about so many scenario's that can occur in any game. Remember that in order for most of these unusual circumstances to happen, there has to be a mistake made by the player, or both the player and the dealer. If the dealer does his job, the integrity of the game is preserved.